User Mapping

I am having an issue validating my user mapping configuration. My connection settings have tested ok but I keep getting an error on step 2.

Error:

A random profile is selected for you to review. Bold fields with no value mean that an error may have been found. To view another profile click ‘‘Next ramdom profile’’. When you are finished close this window.

Status: Error

No users were found using the specified configuration. Try changing the base DN, user filter or username field.

I have the sAMAccoutnName in the username field.

Any ideas to get past this? Do I have to create an AD user/group for this to work?

Dave